In　order　to　study　the　heat　transfer　of　dropwise　condensation　on　differentiated　micro-nano　structure　surfaces,　various　CuO　and　Cu　(OH)2　micro-nano　structures　were　firstly　prepared　by　chemical　etching　on　the　surfaces　of　copper.　Then,　these　micro-nano　structures　were　modified　respectively　with　n-Octadecyl　mercaptan　by　using　self-assembled　monolayers　(SAMs)　technique,　and　the　differentiated　hydrophobic　surfaces　were　obtained　with　different　static　contact　angle　and　surface　energy.　Subsequently,　the　effects　of　differentiated　microstructures　and　contact　angles　on　the　heat　transfer　performances　of　the　dropwise　condensation　were　studied　experimentally,　and　the　mechanism　of　droplets　coalescence　and　sweeping　in　the　process　of　condensation　heat　transfer　was　also　studied　visually　The　experimental　results　showed　that　the　heat　transfer　of　CuO-I　surface　with　similar　contact　angle　and　different　micro　structures　was　very　close　to　that　of　Cu(OH)　2,which　was　1.5　times　of　that　of　smooth　surface.　However,　the　condensation　heat　transfer　performance　of　CuO-II　surface,　with　contact　angles　of　125°,　was　significantly　larger　than　that　of　CuO-I,　which　was　about　3　times　of　the　heat　transfer　of　smooth　surface.　Furthermore,　the　both　coalescence　and　sweeping　frequencies　of　droplets　on　CuO-I　surface　was　significantly　lower　than　that　of　CuO-II　under　the　similar　subcooling.　©　2018,　Science　Press.　All　right　reserved.